29 across
Teach
cool
new
Topic?
(9)
Teach cool new Topic? (9)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The anagram indicator "new" tells us to rearrange the letters of "teach cool" to get CHOCOLATE. The definition Topic? works by example — Topic being a discontinued brand of chocolate bar, with the question mark signalling the definition-by-example.